public class P011LargestProductInAGrid
{
    public static void main(String[] args)
    {
        int[][] data = { toIntArray("08 02 22 97 38 15 00 40 00 75 04 05 07 78 52 12 50 77 91 08"),
                toIntArray("49 49 99 40 17 81 18 57 60 87 17 40 98 43 69 48 04 56 62 00"),
                toIntArray("81 49 31 73 55 79 14 29 93 71 40 67 53 88 30 03 49 13 36 65"),
                toIntArray("52 70 95 23 04 60 11 42 69 24 68 56 01 32 56 71 37 02 36 91"),
                toIntArray("22 31 16 71 51 67 63 89 41 92 36 54 22 40 40 28 66 33 13 80"),
                toIntArray("24 47 32 60 99 03 45 02 44 75 33 53 78 36 84 20 35 17 12 50"),
                toIntArray("32 98 81 28 64 23 67 10 26 38 40 67 59 54 70 66 18 38 64 70"),
                toIntArray("67 26 20 68 02 62 12 20 95 63 94 39 63 08 40 91 66 49 94 21"),
                toIntArray("24 55 58 05 66 73 99 26 97 17 78 78 96 83 14 88 34 89 63 72"),
                toIntArray("21 36 23 09 75 00 76 44 20 45 35 14 00 61 33 97 34 31 33 95"),
                toIntArray("78 17 53 28 22 75 31 67 15 94 03 80 04 62 16 14 09 53 56 92"),
                toIntArray("16 39 05 42 96 35 31 47 55 58 88 24 00 17 54 24 36 29 85 57"),
                toIntArray("86 56 00 48 35 71 89 07 05 44 44 37 44 60 21 58 51 54 17 58"),
                toIntArray("19 80 81 68 05 94 47 69 28 73 92 13 86 52 17 77 04 89 55 40"),
                toIntArray("04 52 08 83 97 35 99 16 07 97 57 32 16 26 26 79 33 27 98 66"),
                toIntArray("88 36 68 87 57 62 20 72 03 46 33 67 46 55 12 32 63 93 53 69"),
                toIntArray("04 42 16 73 38 25 39 11 24 94 72 18 08 46 29 32 40 62 76 36"),
                toIntArray("20 69 36 41 72 30 23 88 34 62 99 69 82 67 59 85 74 04 36 16"),
                toIntArray("20 73 35 29 78 31 90 01 74 31 49 71 48 86 81 16 23 57 05 54"),
                toIntArray("01 70 54 71 83 51 54 69 16 92 33 48 61 43 52 01 89 19 67 48"), };
        
        int max = 0;
        for (int x = 0; x < 16; x++)
        {
            for (int y = 0; y < 20; y++)
            {
                int current = data[x][y] * data[x + 1][y] * data[x + 2][y] * data[x + 3][y];
                if (current > max)
                {
                    max = current;
                }
            }
        }
        
        for (int x = 0; x < 20; x++)
        {
            for (int y = 0; y < 16; y++)
            {
                int current = data[x][y] * data[x][y + 1] * data[x][y + 2] * data[x][y + 3];
                if (current > max)
                {
                    max = current;
                }
            }
        }
        
        for (int x = 0; x < 16; x++)
        {
            for (int y = 0; y < 16; y++)
            {
                int current = data[x][y] * data[x + 1][y + 1] * data[x + 2][y + 2] * data[x + 3][y + 3];
                if (current > max)
                {
                    max = current;
                }
            }
        }
        
        for (int x = 0; x < 16; x++)
        {
            for (int y = 0; y < 16; y++)
            {
                int current = data[x][y+3] * data[x + 1][y + 2] * data[x + 2][y + 1] * data[x + 3][y];
                if (current > max)
                {
                    max = current;
                }
            }
        }
        
        System.out.println(max);
    }
    
    private static int[] toIntArray(String string)
    {
        String[] split = string.split(" ");
        int[] ints = new int[split.length];
        int index = 0;
        for (String s : split)
        {
            ints[index] = Integer.parseInt(s);
            index++;
        }
        
        return ints;
    }
}
